Siebenhaar is a German language surname. It is a nickname for a person with sparse hair growth– and may refer to:
Alex Siebenhaar (1927–2022), Swiss rower Klaus Siebenhaar (1952), German university lecturer, publisher and cultural manag Toni Siebenhaar (1923–2000), German rower Willem Siebenhaar (1863–1936), social activist and writer in Western Australia
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